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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29531f6a4bf160d52ea82e2a13ae2d41fa41fe20943eb58290b1b51363149ad2' 
  AND token = 'nt1MvowBjOQA6HzGVraZkQ13Das78MHkThhgHi2GLRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}